<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8" />
		<title>Document</title>
	</head>
	<body>
		<script type="text/javascript" >
			let Vue = {}

			Vue.extend = function(){
				function VueComponent(){

				}
				VueComponent.prototype.x = 900
				return VueComponent
			}

			const School = Vue.extend()
			const Hello = Vue.extend()
			const Welcome = Vue.extend()

			const s1 = new School()
			const h1 = new Hello()
			const w1 = new Welcome()

			console.log(s1)
			console.log(h1)
			console.log(w1)

		</script>
	</body>
</html>